Perhaps you should try some spelling variations:
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"oecd academic departments working papers" » "oecd academic patents working papers", "oecd academic developments working papers", "oecd academic departments wrong papers", "oecd academic department work papers", "oecd academic departments using papers", "lead academic departments working papers", "second academic departments working papers", "world academic departments working papers"
"oecd economic department working papers" » "oecd economics department working papers", "oecd economic debasement working papers", "oecd economic experiment working papers", "oecd economic department boarding papers", "oecd economic department work papers", "oecd economic department solving papers"
"oecd economic department nursing papers" » "oecd economics department nursing papers", "oecd economic debasement nursing papers", "oecd economic experiment nursing papers", "oecd economic department guessing papers", "oecd economic departments using papers", "oecd economic department building papers", "oecd economic department using papers", "oecd economic department nursing fathers", "oecd economic department nursing experts"
"oecd economic department working paper" » "oecd economics department working paper", "oecd economic debasement working paper", "oecd economic experiment working paper", "oecd economic department boarding paper", "oecd economic department work paper", "oecd economic department solving paper"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("oecd economic department working papers") OR ("oecd economic department nursing papers"))) OR ((("oecd academic department working papers") OR ("oecd academic departments working papers"))))) OR ("oecd economic department working paper")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"oecd economic department working papers\") OR (\"oecd economic department nursing papers\"))) or (((\"oecd academic department working papers\") or (\"oecd academic departments working papers\"))))) or (\"oecd economic department working paper\"))".
• Removing quotes may allow a broader search: (((((( oecd economic department working papers ) OR ( oecd economic department nursing papers ))) or ((( oecd academic department working papers ) or ( oecd academic departments working papers ))))) or ( oecd economic department working paper )).
• Adding a wildcard symbol may retrieve word variants: (((((("oecd economic department working papers") OR ("oecd economic department nursing papers"))) or ((("oecd academic department working papers") or ("oecd academic departments working papers"))))) or ("oecd economic department working paper"))*.